[llvm] [LLVM][TableGen] Parameterize NumToSkip in DecoderEmitter (PR #135882)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-nvptx64-nvidia-win` running on `as-builder-8` while building `llvm` at step 7 "test-build-unified-tree-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/155/builds/8449

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 7 (test-build-unified-tree-check-llvm) failure: test (failure)
******************** TEST 'LLVM :: TableGen/trydecode-emission.td' FAILED ********************
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 1
c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe -gen-disassembler -I C:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\llvm-project\llvm\test\TableGen/../../include C:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\llvm-project\llvm\test\TableGen\trydecode-emission.td | c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\filecheck.exe C:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\llvm-project\llvm\test\TableGen\trydecode-emission.td
# executed command: 'c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe' -gen-disassembler -I 'C:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\llvm-project\llvm\test\TableGen/../../include' 'C:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\llvm-project\llvm\test\TableGen\trydecode-emission.td'
# .---command stderr------------
# | Assertion failed: DestIdx > FixupIdx + NumToSkipSizeInBytes && "Expecting a forward jump in the decoding table", file C:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\llvm-project\llvm\utils\TableGen\DecoderEmitter.cpp, line 151
# | PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
# | Stack dump:
# | 0.	Program arguments: c:\\buildbot\\as-builder-8\\llvm-nvptx64-nvidia-win\\build\\bin\\llvm-tblgen.exe -gen-disassembler -I C:\\buildbot\\as-builder-8\\llvm-nvptx64-nvidia-win\\llvm-project\\llvm\\test\\TableGen/../../include C:\\buildbot\\as-builder-8\\llvm-nvptx64-nvidia-win\\llvm-project\\llvm\\test\\TableGen\\trydecode-emission.td
# | Exception Code: 0x80000003
# |  #0 0x00007ff6e5653915 (c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe+0x2e3915)
# |  #1 0x00007ffb8044d88d (C:\Windows\System32\ucrtbase.dll+0x6d88d)
# |  #2 0x00007ffb8044e761 (C:\Windows\System32\ucrtbase.dll+0x6e761)
# |  #3 0x00007ffb804500c1 (C:\Windows\System32\ucrtbase.dll+0x700c1)
# |  #4 0x00007ffb804503f1 (C:\Windows\System32\ucrtbase.dll+0x703f1)
# |  #5 0x00007ff6e5518297 (c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe+0x1a8297)
# |  #6 0x00007ff6e5512d02 (c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe+0x1a2d02)
# |  #7 0x00007ff6e551347f (c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe+0x1a347f)
# |  #8 0x00007ff6e55194fe (c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe+0x1a94fe)
# |  #9 0x00007ff6e550cab1 (c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe+0x19cab1)
# | #10 0x00007ff6e55269db (c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe+0x1b69db)
# | #11 0x00007ff6e56885c7 (c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe+0x3185c7)
# | #12 0x00007ff6e568c25a (c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe+0x31c25a)
# | #13 0x00007ff6e53ad5ca (c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe+0x3d5ca)
# | #14 0x00007ff6e56b8e64 (c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\llvm-tblgen.exe+0x348e64)
# | #15 0x00007ffb82d07ac4 (C:\Windows\System32\KERNEL32.DLL+0x17ac4)
# | #16 0x00007ffb83fca8c1 (C:\Windows\SYSTEM32\ntdll.dll+0x5a8c1)
# `-----------------------------
# error: command failed with exit status: 0x80000003
# executed command: 'c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\filecheck.exe' 'C:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\llvm-project\llvm\test\TableGen\trydecode-emission.td'
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  c:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\build\bin\filecheck.exe C:\buildbot\as-builder-8\llvm-nvptx64-nvidia-win\llvm-project\llvm\test\TableGen\trydecode-emission.td
# `-----------------------------
# error: command failed with exit status: 2

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/135882